| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire which includes a pitch variation structure and can improve steering stability.SOLUTION: A pneumatic tire includes a specific land part in which lug grooves are formed in the same pattern, and in which a plurality of types of pitch areas having different lengths in the tire circumferential direction are arranged in rows in the tire circumferential direction. When, among circumferential main grooves, a circumferential main groove arranged outside the specific land part in the tire width direction is defined as a specific circumferential main groove, the specific circumferential main groove is such that, in the tire circumferential direction, the curvature radius of a round shape in a pattern section adjacent to a pitch area with a smaller pitch is larger than the curvature radius of a round shape in a pattern section adjacent to a pitch area with a larger pitch. In addition, in a section including a border between the two pitch areas, the specific circumferential main groove has a round shape change section in which the curvature radius of a round shape is changed from the curvature radius of the round shape in one of the pattern sections to the curvature radius of the round shape in the other of the pattern sections, and which is arranged in a section including the border between the two pitch areas in a range satisfying the relation 0.05P≤A≤0.4P when the length of the larger pitch is P, and the length of the round shape change section is A. |
